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gerrit-public.fairphone.software / platform / tools / apksig / 76e93cc194bb00668358e1303112522f4df6f9e1
commit76e93cc194bb00668358e1303112522f4df6f9e1[log] [tgz]
authorJooyung Han <jooyung@google.com>Wed Jul 21 01:18:21 2021 +0000
committerAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>Wed Jul 21 01:18:21 2021 +0000
tree30f23d8fb235eb5cbfd6945b3bca75c709ff9ba9
parent52b4ac61dce63c0dcb3553e8cb9f17465eb2765e [diff]
parent0f36b1cacc202393faecdcf021c01a602dd23cc5 [diff]
Add update for EOCD comment length am: 8ecf3e5d5d am: e73cdfba49 am: 4d430af0b8 am: 0f36b1cacc

Original change: https://android-review.googlesource.com/c/platform/tools/apksig/+/1762390

Change-Id: I70babd119275f9b7dd6fb5951d89d27b479f1e6d
tree: 30f23d8fb235eb5cbfd6945b3bca75c709ff9ba9
  1. etc/
  2. src/
  3. Android.bp
  4. android_plugin_for_gradle.gradle
  5. build.gradle
  6. LICENSE
  7. OWNERS
  8. README.md
README.md

apksig

apksig is a project which aims to simplify APK signing and checking whether APK signatures are expected to verify on Android. apksig supports JAR signing (used by Android since day one) and APK Signature Scheme v2 (supported since Android Nougat, API Level 24). apksig is meant to be used outside of Android devices.

The key feature of apksig is that it knows about differences in APK signature verification logic between different versions of the Android platform. apksig thus thoroughly checks whether an APK's signature is expected to verify on all Android platform versions supported by the APK. When signing an APK, apksig chooses the most appropriate cryptographic algorithms based on the Android platform versions supported by the APK being signed.

The project consists of two subprojects:

  • apksig -- a pure Java library, and
  • apksigner -- a pure Java command-line tool based on the apksig library.

apksig library

apksig library offers three primitives:

  • ApkSigner which signs the provided APK so that it verifies on all Android platform versions supported by the APK. The range of platform versions can be customized.
  • ApkVerifier which checks whether the provided APK is expected to verify on all Android platform versions supported by the APK. The range of platform versions can be customized.
  • (Default)ApkSignerEngine which abstracts away signing APKs from parsing and building APKs. This is useful in optimized APK building pipelines, such as in Android Plugin for Gradle, which need to perform signing while building an APK, instead of after. For simpler use cases where the APK to be signed is available upfront, the ApkSigner above is easier to use.

NOTE: Some public classes of the library are in packages having the word "internal" in their name. These are not public API of the library. Do not use *.internal.* classes directly because these classes may change any time without regard to existing clients outside of apksig and apksigner.

apksigner command-line tool

apksigner command-line tool offers two operations:

  • sign the provided APK so that it verifies on all Android platforms supported by the APK. Run apksigner sign for usage information.
  • check whether the provided APK's signatures are expected to verify on all Android platforms supported by the APK. Run apksigner verify for usage information.

The tool determines the range of Android platform versions (API Levels) supported by the APK by inspecting the APK's AndroidManifest.xml. This behavior can be overridden by specifying the range of platform versions on the command-line.